Ni-Al基涂层制备工艺及其抗氧化性能

摘要

通过调整固体粉末渗铝法工艺在镍基高温合金DZ417G基体上制备了Ni-Al二元成分区间内组织可控的y′-Ni3Al、y′-Ni3Al+β-NiAl、β-NiAl、β-NiAl+δ-Ni2Al3和δ-Ni2Al3涂层,采用光学显微镜、X射线衍射仪和扫描电镜对涂层的结构、断面形貌以及高温氧化后的表面形貌进行观察和分析.900℃和1 100℃空气恒温氧化实验结果表明:涂层能显著提高材料的抗氧化性能,在涂层厚度相同的情况下,NiAl涂层抗氧化性能最好.%Theγ-Ni3Al,γ-Ni3Al+β-NiAl, β-NiAl, β-ff-NiAl+ δ--i2Al3 and δ-Ni2AI3 coatings with structures controllable in the Ni-Al binary components range on Ni-based superalloy DZ417G were prepared by using appropriate pack cementation processes. The structures, cross sections and surface morphologies after high temperature oxidation of the coatings were observed and analyzed by optical microscopy, X-ray diffractometry and scanning electron microscopy. The experimental results of isothermal air oxidation at 900 °C and 1 100 *C indicate that these coatings can significantly improve the oxidation resistance of the substrate materials, and the oxidation resistance of NiAl coatings is the best at the same thickness of coatings.